[ 18.730812] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.898646] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.300061] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.136190] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) [ 22.295084] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) Warning: Permanently added '10.128.15.225' (ECDSA) to the list of known hosts. [ 27.672218] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.762258] kasan: CONFIG_KASAN_INLINE enabled [ 27.778006] kasan: CONFIG_KASAN_INLINE enabledkasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.780641] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.780646] Dumping ftrace buffer: [ 27.780649] (ftrace buffer empty) [ 27.780652] Modules linked in: [ 27.780657] CPU: 0 PID: 3783 Comm: syzkaller138586 Not tainted 4.4.116-g20ddb25 #15 [ 27.780659] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.780662] task: ffff8800aca04800 task.stack: ffff8800aaa08000 [ 27.780675] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.780677] RSP: 0018:ffff8800aaa0f9f0 EFLAGS: 00010a07 [ 27.780680] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b889b [ 27.780682] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 27.780685] RBP: ffff8800aaa0fa00 R08: 0000000048000000 R09: 0000000000001e30 [ 27.780687] R10: 0000000000002100 R11: 1ffff10015541f1c R12: 0000000000000004 [ 27.780689] R13: 0000000000000020 R14: ffff8800b42bc200 R15: dffffc0000000000 [ 27.780693] FS: 00007f88be3fc700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.780695] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.780697] CR2: 0000000020e94000 CR3: 00000000bbb08000 CR4: 0000000000160670 [ 27.780703] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.780705] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.780705] Stack: [ 27.780710] 0000000000000246 ffff8800b42bc358 ffff8800aaa0fa60 ffffffff825b88c1 [ 27.780714] ffff8800b42bc370 ffffed001685786b ffffed001685786e ffff8800b42bc368 [ 27.780718] dead4ead00000000 ffff8800b42bc340 0000000000000000 0000000000000000 [ 27.780719] Call Trace: [ 27.780729] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.780733] [] sg_finish_rem_req+0x2b5/0x340 [ 27.780737] [] sg_new_read.isra.18+0x17d/0x3c0 [ 27.780740] [] sg_read+0x8bc/0x1490 [ 27.780748] [] ? __check_object_size+0x154/0x35b [ 27.780752] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.780757] [] ? fsnotify+0xee0/0xee0 [ 27.780766] [] ? avc_policy_seqno+0x9/0x20 [ 27.780771] [] do_loop_readv_writev+0x141/0x1e0 [ 27.780775] [] ? security_file_permission+0x89/0x1e0 [ 27.780779] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.780783] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.780786] [] do_readv_writev+0x5dd/0x6e0 [ 27.780789] [] ? vfs_write+0x530/0x530 [ 27.780793] [] ? sg_ioctl+0x29f0/0x29f0 [ 27.780796] [] ? __vfs_write+0x10b/0x450 [ 27.780803] [] ? __fget+0x20b/0x3b0 [ 27.780806] [] ? __fget+0x232/0x3b0 [ 27.780809] [] ? __fget+0x47/0x3b0 [ 27.780812] [] vfs_readv+0x78/0xb0 [ 27.780815] [] SyS_readv+0xd9/0x240 [ 27.780818] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 27.780824] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.780829] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 27.780879] Code: c6 9f 0c 00 e9 78 fd ff ff 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 49 [ 27.780882] RIP [] __free_pages+0x21/0x90 [ 27.780884] RSP [ 27.780889] ---[ end trace 3b75a94607e9d423 ]--- [ 27.780892] Kernel panic - not syncing: Fatal exception [ 27.783588] Dumping ftrace buffer: [ 27.783590] (ftrace buffer empty) [ 27.783592] Kernel Offset: disabled [ 28.133519] Rebooting in 86400 seconds..